Switch device for automatic oil-pressure control and signaling apparatus



P; BLASCHKE r 1,769,673

syrrcn DEVICE Fm AUTolATIc oIL izEssURE coNTnoL np. SIGNALIHG APPARATUS 511e@ Aug. 1f?.- 1927k Patented July 1, 1930 VUNITED STATES PATENT OFFICE PHILIP? BLASCHKE, F FISCHAMEND, AUSTRIA SWITCH DEVICE FOR AUTOMATIC OIL-PRESSURE COLlTROL AN D' SIGNALING APPARATUS Application led August 17, 1927, Serial No. 213,509, and in Austria April 10, 19326.

This invention relates to an: Automatic oil pressure control and signaling apparatus. The known oil pressure lubricating devices of the type to which my invention relates are commonly provided with a contact part governed by the excess pressure in the oil pipes for switching in a warning signal in case of the pressure lubrication oi the motor failing. With acoustic signals especially it 'is necessary to close the circuit of the. controlling apparatus when starting and stopping the motor. If the closing of the current circuit is omitted when starting the motor, the apparatus though functioning does not emit signals.

The present invention consists thereirnthat a second contact piece is inserted in these plants and connected `in series to the "con tact piece mentioned above. This second 2G contact is governed by the partial vacuum of the suction pipe of the motor and is placed in the signal series circuit, thus automatically switching in or out the control apparatus, when starting or stopping the motor.

The illustration shows an example of the object of this invention. In the Figs. 1, 2, 3 the apparatus is represented in section in the various working positions, Fig. l with the motor stopped, Fig. 2 with the motor running and the pressure lubrication functioning while Fig. 3 illustrates the working of the apparatus with the motor running within effective pressure lubrication. y

A cylinder 2 provided with a piston 3 is inserted into theoii pipe 1. A pressure spring l is constantly endeavoring to move tFhe cylinder to the position illustrated in 1g. i. cooperate with one end of a contact spring 6 which is fastened to but insulated from the cylinder 2 by means of a plate 7. This plate 7 carries the contact piece 8, which is so designed asto come into electric contact with the other end 9 of the spring 6, and is connected to the usual signal line 10. An arm 11A provided on cylinder 2, which is connected to the earth, carries a second cylinder l2, whichis connected by pipe 13 to the suction line of the motor. A spring 14 is constantly trying to lift piston 15 of the last mentioned The head 5 of the piston rod may` cylinder (Fig. 1) whereby the head 16 of `the piston rod is made to act on the end 9 of the sprinpr 6 and the Contact between that part and the contact piece 8 is interrupted.

The position characterized by Fig. 1 corresponds to the conditions of the motor when stopped, as the piston 3 owing to the want of pressure in the oil pipe line l has reached its lowest position, While piston 15 owing :to the absence of a suction eiiect of the motor y,.ftact piece 8 is closed. As long as the oil pressure is maintained the circuit is broken and no signal can be given.

In case of the oil pressure lubrication failing while vthe motor is running, the piston 3 descends under the pressure of spring 4: (Fig. 3) whereupon without any change taking place in respect to the contact 8, 9, the contacts 5, 6 are closed and the signal is actuated until either the motor is stopped or the fault ofthe oil pressure line is rectiiied. The contact 8, 9 which is always closed as long as the motor is running, is bound to be automatically interrupted When stopping the latter.

In the place of the piston 15 a membrane or a valve may be employed.

I claim:

In la circuit closer for an alarmcircuit, of a motor system having pressure lubrication, a cylinder, a piston therein movable in one direction under pressure and in the reverse direction upon the absence of pressure, primary and secondary contacts arranged in series,`a contact carried by the aforesaid piston to engage the primary contact on the movement of the piston in the secondnamed direction, a tertiary contact adapted to be automatically engaged by the secondary contact when said secondary contact is unrestrained from action, a second cylinder, a piston in said cylinder carrying an insulated Contact for engagement with the secondary Contact, said piston being automatically movin one direction to shift the secondary Contact out of engagement with the tertiary Contact and being movable by suction in the reverse direction to permit said secondary contact to engage said tertiary contact, a current supply conductor connected to said tertiary Contact, and a common ground connection :for said cylinders.

ln testimony whereof` I aiX my signature.

PHILIPP BLASCHKE. 

